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Thu, 26 Oct 2023 07:18:40 GMT Received: from [10.216.23.63] (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.39; Thu, 26 Oct 2023 00:18:37 -0700 Message-ID: Date: Thu, 26 Oct 2023 12:48:33 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH] mm/sparsemem: fix race in accessing memory_section->usage To: David Hildenbrand , Andrew Morton CC: Pavan Kondeti , , , , , , , References: <1697202267-23600-1-git-send-email-quic_charante@quicinc.com> <20231025143541.e7cf114239b84105711a5f70@linux-foundation.org> <2a7b5e72-604a-48e1-9c0e-3b9ad15e7f78@redhat.com> Content-Language: en-US From: Charan Teja Kalla In-Reply-To: <2a7b5e72-604a-48e1-9c0e-3b9ad15e7f78@redhat.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: e1jzaWrCDQInR2VpowxsGx1SQdaP1nC_ X-Proofpoint-ORIG-GUID: e1jzaWrCDQInR2VpowxsGx1SQdaP1nC_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-26_03,2023-10-25_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 spamscore=0 mlxscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 mlxlogscore=918 phishscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2310170001 definitions=main-2310260060 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 9DD38A0011 X-Stat-Signature: 6g5ebz9h9wsrg4zsih177wadk7tfefdx X-Rspam-User: X-HE-Tag: 1698304729-634958 X-HE-Meta: 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 vWn5SSEe eoY0POcOA6QjEOcmGbX9hkFjNdxzyngUyd2aefseAK7oYH5FJLjh3z4xPpearqSJaIDWxLXYiT5vJMpb2mG8T0aAh7vQ3HyvISqeQWNa0rMHzPMcGUVubszvXqwHcStRIr92W0nJayE4l8R94uBGtlOZhHiPxY0rc26CYbVGF8Tkmre7R9tGAYb+QfO2tIfe2FR6qv+G3WrcwdjnRKe0EExQ1PeO2FKriVbIc4Ad45NabKqM0sv8VY1A7gy46ZT8QAs7y4XCfGqvfgSuZcGBTaHBlCf7M4HL4mvgFZZVBDOVsDepwhe058c0GQ+1IAQCjCPtk X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Thanks Andrew/David, On 10/26/2023 12:30 PM, David Hildenbrand wrote: >> >> How's it coming along? >> I was in vacation... Will send V2 by Monday IST. >> Given that we're at 6.6-rc7 and given that this issue is causing >> daily crashes in your device farm, I'm thinking that we use the current >> version of your patch for 6.6 and for -stable.  We can look at the >> kfree_rcu() optimization for later kernel releases? > > Any particular reason we have to rush this in? It's been seen by one > company in a testing farm; there were no other reports, especially not > from production systems. ... and the issue seems to be quite old. I think we can work on to merge the final solution here rather than an incremental one. At least internally we are unblocked with V1. Thanks, Charan